Hi,
Thank for your replies.
I tried to generate a circuit with the above parameters. Below are my points and circuit. I am struggling a bit as i am a bit weak on analoge.
1) Selected a dual supply rail-rail opamp TI OPA191IDBVT
2) Shifted the input voltage down by 2.5V
3) Calculated the gain on be 0.5
Please feel free to make any comments.
Thanks,
Rocketman46
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Hi,
OK I see I have made a mistake. For gain below 1 an opamp is not required. That is why you mentioned using a resistor network and then a unity gain buffer. My misunderstanding is 0v to -5V voltages. I get +5V to -5V is a 10V swing. I have expanded my design problem below:
1) if 10V is put across two 10k resistors with gnd being 0V, vout out is 5V.
2) when say -2V is put across the two 10k resistors and gnd being -5V, vout will be negative. So therefore vout on the unity gain buffer will be negative? Everything i have done previously is 0V to 5V, i have never really done below 0V designs.
Can anybody help where I am going wrong.
Thanks,
Rocketman46